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In my opinion, or what I've learned, the z pin doesn't matter much, as it is more about the internals lining up. I would check more of why they wouldn't line up as there shouldn't be anyyhing preventing it.

one of them has been hacked. there is red permatex coming out from under the power tube and it has had a hole drilled in the front half which has been plugged(came to me this way in a marker). the second one has an ANS phase 2 back half. neither combination of back halves on the good front will line up for the field strip screw to go in unless i pull the z lock pin.

The early valves didn't have indexed threading. That meant only the original backs with matching serial numbers were 100% guaranteed to line up with the front half. Later valves had indexed threading so all threads were cut exactly the same, which allowed any back to be used on any front.

Except for the Automag in front, its usually the man behind the equipment that counts.

one of them has been hacked. there is red permatex coming out from under the power tube and it has had a hole drilled in the front half which has been plugged(came to me this way in a marker). the second one has an ANS phase 2 back half. neither combination of back halves on the good front will line up for the field strip screw to go in unless i pull the z lock pin.

Those PT orings are a little hard to locate and loctite is a good idea on there once it is removed. You should be able to clean that up. Is the hole in the front half a 1/8 NPT hole with a pipe plug? If so, it may have been a "Smart Valve" that was cleaned up.

Anyone remember if the smart mags came out before AGD started indexing valves?